Why is the blood of the human body and the blood of fish and various animals red

Well,Don't engage in those rambling things.,To put it simply,It's because it contains iron ions (red)So the blood is red.。。 This is just the basics, and maybe there's something deeper.

Because the heart is the main blood, and because the heart is fire, the color of the five elements is red.

Because there are a lot of red blood cells in the human blood.

Not all animals' blood is red.

The composition and physiological state of the blood of various animals are different, so their blood will also show different colors. Most vertebrate blood is red, while invertebrate blood is blue or green.

For example: the color of the blood of earthworms is rosy red, while the blood of cuttlefish living in the sea is green, and as for shrimp and crabs, their blood is white like milk. The blood of insects contains special pigment substances, which allows their blood to take on different colors, such as green, orange, pink, etc.

The color of the blood mainly depends on the amount of metal in the red blood cells and the amount of substances dissolved in the blood. All vertebrates, even earthworms, leeches, flies contain iron oxide in heme. As a result, their blood (including humans) is red.

Scorpions, spider mussels, and octopus squid do not have heme in their blood, but instead have hemocyanin, which contains the metallic copper, so the blood is blue.

In the ocean, there is a species of king black and horsefoot crab whose blood is blue, while the blood of sea oyster and cuttlefish is green. It can be seen that the color of blood is determined by the material elements contained in the proteins of blood cells. The one that turns blood blue is called hemocyanin because it contains copper; The one that turns blood green is called hemochlorvidin because it contains vanadium.

Envy fish are also bloody and red. Other cold-blooded animals, including amphibians and reptiles, also possess blood, and they are all red as well. In terms of blood, fish and humans have some things in common, for example, fish also have a blood circulatory system in the remnants of their body socks, and fish also have a heart like a water pump.

Hemoglobin is also present in the blood of fish, which is also used to transport oxygen, so the color of their blood is also red. If the fish's fresh, active main blood vessels are cut, the fish's blood will be seen flowing out. The fish we usually eat is actually the muscle tissue of the fish, and these muscle tissues also have many tiny blood vessels, so the blood cannot be seen.

If the fish is already dead, the blood in its brother rocks will clot or collect in certain parts. Although the fish we bought from the market had already been processed, we could still see some blood stains on their spines, as several important blood vessels passed through them.

Question 1: What color does the blood of animals have The blood of animals is colorful and comes in all colors.

The color of the blood depends on the metal ions in the hemoglobin in the blood.

The blood of birds and mammals is red because the metal ions in hemoglobin are iron ions, and the iron ions are red (rust color).

The blood of marine arthropods such as shrimp, crabs, horseshoe crabs, and some marine mollusks such as some shellfish is blue because the metal ions in their hemoglobin are copper ions. Copper ions are blue.

In sea squirts, vanadium-containing hemoglobin is found. Blood containing vanadium trioxide is green, vanadium tetroxide is blue, and vanadium pentoxide is orange.

Some annelids have hemochlorogen in their blood, so their blood is green.

Some insects do not have hemoglobin in their blood, so their blood is colorless.

The blood of flies is pink-colored because the metal ions in the hemoglobin of flies are cobalt ions. Cobalt hydrated ions are peach-colored.

The blood of grasshoppers is brown and it is not known what metal ions are.

Question 2: What color is the blood of animals? The blood of horseshoe crabs is blue, and the blood of shrimps is pale cyan.

The color of the blood depends on the color of the hemoglobin, and the color of the hemoglobin depends on the color of the metal that makes up the hemoglobin, and the human is iron, so the blood of humans or higher animals is red. Whereas, the "hemoglobin" of horseshoe crabs is made up of copper, so it is blue.

Here's an excerpt from the web:

In fact, not only the blood of horseshoe crabs in the ocean is of different colors, but also the blood of some other lower animals is of various colors. For example, arthropods and mollusks in the ocean have different colors such as turquoise or white in their blood. The shrimp and crab we are familiar with have cyan blood; There is also a fish called the icefish, which has yellow blood; In the Antarctic Ocean, the blood of some fish is translucent white; There is also an animal called the fan crab, and its blood can change color, turning red for a while, and green for a while, which is really amazing.

As for the reason for the discoloration of the blood of these animals, it is natural that their blood uses other elements to transport oxygen. But what exactly the elements are, and what characteristics they have, are still open to the question.

The blood of various animals is also different in color due to the difference in composition and physiological state, for example, the blood of most vertebrates is red, and the blood of invertebrates is blue, and some are purple-red and green.

So, what exactly determines the color of an animal's blood? Some people believe that the color of blood depends on the color of certain ions it contains, for example, it is believed that the red color of the blood of vertebrates and earthworms is due to the presence of iron ions; Blue blood is due to the presence of copper ions, etc. [in fact, Fe2+ is light green in aqueous solution, Fe3+ is generally yellow; Only Cu(H2O)2+4 is blue, and the rest are colorless.

The blood of animals is not always red, either. The blood of molluscs and arthropods is blue (with exceptions) because the blood lymph of these animals dissolves in a blue copper protein called hemocyanin, which also plays a role in transporting oxygen.

The color of the blood is different, the red color of the blood comes from the hemoglobin in the red blood cells, which is bright red when the oxygen content is high (arterial blood), and dark red when the oxygen content is low (venous blood). Usually blood donation is drawn from venous blood, so the outside ** is dark red. If the blood contains more methemoglobin or other hemoglobin derivatives, it will be purple-black.

The blood of earthworms is very beautiful in color and has a rosy color.

The spider's blood is blue-green. A small ring worm that lives in crevices in rocks by the sea. Its blood is bright green, so some scientists call it a "green blood bug". The blood of the squid is also green.

The blood of shrimp, sea crabs, and hairy crabs is pale blue, so some shrimp and crabs are bloodless animals.

There is a species of arthropod called the horseshoe crab, and its blood is blue. Mussels and snails too.

The snail is more likely to be mistaken for a bloodless animal because its blood is white, a bit like milk.

In Antarctic waters there is a "white blood fish". Its blood is colorless because it has neither hemoglobin nor other substances brought by oxygen, not even blood cells. There are more than a dozen species of precious fish in the waters off Antarctica, and their blood is colorless.

Even more peculiar is a fan bug that lives on rocks on the bottom of the sea. Its blood can actually change color, turning green for a while and red for the next.